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"And we have to start now thinking about the peopling of the Americas as a process, with people coming over here, probably arriving at different times, maybe taking different routes and coming from different places in northeast Asia."

He's still limiting his thinking. Who says that they all came from Asia? If you allow for the use of watercraft, as happened in Australia 20,000 years earlier, then they could have come from many different places.

One interesting theory involves the Solutrean culture from what is now France. Solutrean stone tools look more like Clovis tools than do anything in Asia. If we assume that Clovis technology was developed from something earlier, then nothing in Asia seems to fit as a predecessor. This particular European technology, however, does look like a "pre-Clovis" design.

Our ancestors were far more mobile than we give them credit for.